Using this eyeliner pen is easy. First, make sure your eyelids are clean and dry. Hold the pen like a regular pen and start from the inner corner of your eye, gently drawing a thin line along your lash line. You can make the line as thick or thin as you like. For a more dramatic look, you can extend the line at the outer corner of your eye. When you're done, let it dry for a few seconds. Remember, avoid rubbing your eyes right after applying the eyeliner to prevent smudging. To keep the pen in good condition, always cap it tightly after use. Store it in a cool and dry place, away from direct sunlight. If the pen tip gets dry, you can gently press it on a piece of paper to get the liquid flowing again.